<script lang="ts" setup name="GoodsImage">
import { ref } from 'vue';
import { useMouseInElement } from '@vueuse/core'
import { computed } from '@vue/reactivity';
const target = ref(null)
const { isOutside, elementY, elementX } = useMouseInElement(target)
defineProps<{
  images: string[]
}>()
const active = ref(0)
const position = computed(()=>{
  let x = elementX.value-100
  let y = elementY.value-100
  if(x<=0) x=0
  if(y<=0) y=0
  if(x>=200) x=200
  if(y>=200) y=200
  return {
    x,
    y
  }
})
</script>
<template>
  <div class="goods-image">
    <!-- 大图容器 -->
    <div class="large" :style="[{
       backgroundImage: `url(${images[active]})`,
       backgroundPosition:`${-position.x*2}px ${-position.y*2}px`
        }]" v-show="!isOutside"></div>
    <div class="middle" ref="target">
      <img :src="images[active]" alt="" />
      <!-- 遮罩层 -->
      <div class="layer" 
      v-show="!isOutside"
      :style="{left:`${position.x}px`, top:`${position.y}px`}">
      </div>
    </div>
    <ul class="small">
      <li v-for="(item, index) in images" :key="item" :class="{ active: index === active }"
        @mouseenter="active = index">
        <img :src="item" alt="" />
      </li>
    </ul>
  </div>
</template>

<style scoped lang="less">
.goods-image {
  width: 480px;
  height: 400px;
  position: relative;
  display: flex;
  z-index: 500;

  .large {
    position: absolute;
    top: 0;
    left: 412px;
    width: 400px;
    height: 400px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    background-repeat: no-repeat;
    background-size: 800px 800px;
    background-color: #f8f8f8;
  }

  .middle {
    width: 400px;
    height: 400px;
    position: relative;
    cursor: move;

    .layer {
      width: 200px;
      height: 200px;
      background: rgba(0, 0, 0, .2);
      left: 0;
      top: 0;
      position: absolute;
    }
  }

  .small {
    width: 80px;

    li {
      width: 68px;
      height: 68px;
      margin-left: 12px;
      margin-bottom: 15px;
      cursor: pointer;

      &:hover,
      &.active {
        border: 2px solid @xtxColor;
      }
    }
  }
}
</style>
